Updated with description on how to use SafariLauncher for real device.

Added some description on how to run tests against Safari on a real device.
Merge pull request #1408 from snevesbarros/master

Updated with description on how to use SafariLauncher for real device.
make sure command timeout is reset for proxied devices too (fix #1404)
Merge pull request #1410 from jlipps/master

make sure command timeout is reset for proxied devices too (fix #1404)